Triple valve.



No. 798,619. PATENTED SEPT. 5, 1905.

W. K. OMIGK. TRIPLE VALVE.

APPLICATION FILED APR.23, 1902.

2 SHEETS-SHEET 2.

W/TNESSES: INVENTOH Unirse siii-WBS.

PATENT ordnen.

TRIPLE Specification of Letters Patent.

VALVE.

Patented Sept. 5, 1905.

Application tiled April 23, 1902. Serial No. 104,249.

To all 1c/mnt ft 71mg/ concern:

Be it known that I, WILLIAM K. Orrick, a citizen ol the United States,residing at Pontiac, in the count)` ot Oakland and State ol Michigan,have invented certain new and usel`ul Improvements in Triple Valves, ofwhich the l'ollowing is a iull, clear, and exact speci- [ica t ion.

This invention relates to triple valves tor air-brake s vstems. Itsobject is to provide an etticient valve tor air-brake systems whichshall automatically upon each partial reduction oll pressure in thetrain-pipe open communication between the reservoir and thel)rake-cylinder and then close the same without shock and upon increaseot pressure in the train-pipe shall open communication between thebrake-cvlimler and exhaust and then close the same.

The invention also includes teatures oll rnechanical construction whichwill be hereinatter described.

In the drawings, Figure l is a sectional view ot a triple valveembodying in v invention. Fig. 2 is an end view otl the same. Fig. Il isa detail top view showing the valve-ports and slide-valve plate. Fig. -Iis a detail end view ot' the slide-valve, showing the manner ot itsmounting in the valve-plate; and Fig. 5 is a top view olt theslide-valve.

Iielierring more particularlv to the drawings, l represents the casing,which in this instance comprises a central cylindrical part with twoends bolted thereon. In the side ot the casing is titted the slide-valveplate 2, in which are formed the exhaust-port 3, the brake-cylinder port4, and the reservoir-port 5. Fitted against the inner side ot thevalveplate and sliding thereon is the` slide-valve 6. In theconstruction shown the valve 6 slides in a groove T in the valve-plate,as shown in Fig. l. In the slide 6 are the ports S and 9, connected witheach other and adapted to register with ports S and l or 4 and Upon theopposite ends ot the slide-valve 6 are lormed the legs l() 10, whichstraddle and are supported b v the stem l1, a spring 12 being interposedbetween the stem and the slide (i to hold the valve against its scat.The stem 1l is mounted at the respective ends in the pistons 13 and ll,which are Iitted to thel walls ot the casing and move longitudinallyvthereot. The pistons 13 and 14 are provided with the [langes I3 and lilor a purpose to be hereinafterdescribed. At the respective ends of theslide-valve 6 I interpose between the piston and the leg lilla collar l5and a packing-disk 16 and upon the opposite side of thc piston a washer17, the whole being clamped against the. leg l() by a nut 1S. Nuts 1Sbeing tightened the slide G is prevented l'rom moving longitudinallyupon the steln and pistons. In the opposite ends ol the valve thechambers 1.() and 2() are tormed b v the piston 13 or 14 and walls ol'the casing, respectively. Chamber 19 communicates with train-pipe 2l.and chamber 2() communicates with the atmosphere through port 22, whichis opened or closed by the flange 13th Chambers l?) and 2O are connectedtogether by a pipe 23. `In the present case pipe 23 comprises twosections joined togetherlrv a union2-l. The openings 25and26 l'rom therespective endsot pipe 23 into the chambers 2() and IS) are ol' smalldiameter relative. to the diameter ol' the trainpipe 2l, thereb)vpermitting a restricted leakage ot' pressure l'rom one chamber to the.other, and thus accordingl)Y equalizing the pressure in the twochambers. The end 27 ol the stem l l projects through the end 2S ot theguideway 2), lormed in the end of the casing, and impinges against theend olE the pin 30. Upon pin 30 is Ylormed a shoulder 3l, between whichshoulder and the inner end 323 ol a screw-plug -L is interposed a spring32, tending to torce the pin 3() outward against the end 28. W'hen thepin is in this position, the stem 11 will hold the slide-valve (S in lapposition, closingr all of the ports. I'Vhen the valve. is in this lap orcentral position, the llanges lil and l-l will be in such position thatboth ports 22 and 2G will be covered by flanges 3 and l-t, although port26 will be nearer the edge olE the [lange ll than port 22 is to the edgeof the [lange 13, and therefore a slight movement oll the pistons to theright would uncover port 22, port. 26 remaining covered. Movement in theopposite direction would uncover port 26, port 22 remaining covered.This central position is the running position ol" the valve. Then apartial sudden reduction ol" pressure occurs in the train-pipe, bringingthis pressure below the pressure trapped in chamber 20, the latterpiston will lorce piston 13 lorward, bringing ports S and t) incommunication with ports #l and This opens communication between thereservoir and the brake-cyl- IOO inder. ln moving to this position,however, the flange 14a will have closed port 26, preventing equalizingof pressure in the chainbers, and flange 13a of piston 18 will haveuncovered the port 22, and thereupon the leakage through that porteffects a gradual reduction of pressure in the chamber 20. As thepressure in chamber 2O falls below that in chamber 19 the latterpressure moves the piston 14, so that the slide-valve 6 moves back untilthe stem 27 impinges againstthe pin 80. The tension of spring 32,together with the fact that port 22 will meanwhile have been closedagain, arrests the slide-valve in the lap position, and thus closes allof the ports 3, 4, and 5. If there is not enough pressure upon thebrakes, a further partial reductionof pressure in the train-pipe iseffected and the saine operation as above described again ensues. Anemergency application of the brakes is effected by a complete reductionof pressure in the train-pipe. To release the brakes, the pressure inthe train-pipe is increased, whereupon piston 14 is moved forward andthe stein 27, which iinpinges against pin 30, compresses the spring 32until ports S and 9 are in communication with ports 3 and 4. Thereuponthe brake-cylinder is connected with the exhaust. This movement ofpiston 14 has, however, first caused Hange 13'L1 to cover port 22 andprevent further release of pressure from chamber 20 and then caused theflange 14a to uncover the port 26, and thereupon a leakage of pressurefrom chamber 19 to chamber 20 occurs and gradually continues until thepressure in chambers 19 and 20 is equalized, which permits spring 32 tomove the valve back to the lap position, thus shutting off the exhaust.Should the brakes still be partially applied, the pressure will befurther increased in the train-pipe, whereupon communication will againbe opened between the brake-cylinder and the exhaust and the pressuresin chambers 19 and 20 will be again equalized and said communicationshut oif.

It will be seen that the valve above described effects positively andsimply the steady and gentle application and release of the brakes, thatthere is no loss of air from the brake-cylinder during the applicationof the brakes, and that but a minimum quantity of air is lost from thetrain-pipe in operating the valve. Furthermore, by adjusting the tensionof the spring 32 and the length of stem 27 and flanges 13L1 and 14L orthe area of the ports 25 and 26 the normal position of the valve may bechanged at will, and the pressures required for the operation of thevalve may also be Varied. Therefore it will be understood that l do notherein limit myself to the precise construction or arrangement of theparts or the adjustment thereof shown herein.

lt will be understood, of course, that the pressure in the train-pipewill be varied by any of the means already well known.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a triple valve, the combination of a piston, a chamber on eachside thereof, arestricted connecting passage, a train pipe communicatingwith one of said chambers the other being normally closed and means foropening the other chamber when the train-pipe pressure is reduced,substantially as described.

2'. In a triple valve, the combination of a piston, pressure-chambers onopposite sides thereof, a restricted passage between said chambers, atrain-pipe communicating with one of said chambers, 'and a restrictedexhaust-passage from the other chamber to the atmosphere, substantiallyas described.

3. ln a triple valve, the combination of a piston, pressure-chambers onopposite sides thereof, a restricted passage between said chambers, atrain-pipe, and means for automatically opening one chamber to theatmosphere and closing said restricted passage upon a reduction ofpressure in the trainpipe, substantially as described.

4. In a triple valve, the combination of a piston, pressure-chambers onopposite sides thereof, a restricted passage between saidA chambers, atrain-pipe communicating with one of said chambers, a restrictedexhaustpassage from the other'chamber to the atmosphere, and means forautomatically closing said restricted passage between the chambers upona reduction of pressure in the train-pipe, substantially as described.

5. ln a triple valve, the combination of a piston, pressure-chambers onopposite sides thereof, a restricted passage between said chambers, atrain-pipe communicating with one of said chambers, a restrictedexhaustpassage from the other chamber to the atmosphere,'and means forautomatically closing said restricted passage between the chambers andopening the restricted exhaustpassage, upon a reduction of pressure inthe train-pipe, substantially as described.

6. In a triple valve, the combination of a piston, pressure-chambers onopposite sides thereof, a restricted passage between said chambers, atrain-pipe communicating with one of said chambers, a restrictedexhaust,- passage from the other chamber to the atmosphere, and meansfor automatically opening said restricted passage between the chambersand closing the restricted exhaustpassage upon an increase of pressurein the train-pipe, substantially as described.

7. In a triple valve, the combination of a piston, pressure-chambers onopposite sides thereof, a restricted passage between said IOO IIO

chambers, a train-pipe eonnnunieating with one of said chambers, arestricted exhaustpassage from the other chamber to the atmosphere. andmeans whereby a partial reduction of pressure in the train-pipe ell'ectsa closure of said equaliZing-passage and a further reduction of pressurecll'ects the opening of said exhaust-passage, substantially asdescribed.

8. ln a triple Valve, the combination of a piston, pressure-chambers onopposite sides thereof, a restricted passage between said chambers, atrain-pipe communicating with one of said chambers, a restrictedexhaustpassagc from the other chamber to the atmosphere, and meanswhereby a partial increase of pressure in the train-pipe ell'ects aclosure of said exhaustpassage and further increase of pressure effectsan opening of said equtilizing-passage, substantiallr as described.

t). `ln a triple valve, the combination of a piston, pressure-chamberson opposite sides thereof, a spring normally holding the piston in lapposition when the pressure in the chambers is cqualized, anequalizing-passage between the chambersv and means for effecting adifference in pressure between the chambers by opening one of them tothe atmosphere` substantiallyv as described.

lt). ln a triple Valve., the combination of a piston and chamber on eachside thereof, a restricted connecting-Imssage, a train-pipecommunicating with one of said chambers, said piston opening the otherchamber to the atmosphere when the train-pipe pressure is reduced,substantiallyv as described.

l l. ln a triple Valve, the combination of a cylindrical casing, endstherefor a piston moving longitudinally therein, and forming chambers inopposite sides thereof, an equalizing-passage between said chambers,means `for opening one of them to the atmosphere and a l lange carriedby said piston and adapted to control said passage, substantially asdescribed.

l2. ln a triple Valve, the combination of a cylindrical casing havingclosed ends, a double piston moving in said casing and forming chambersin the opposite ends of the lasing, a slide-valve ciu'ried by saidpiston, a trainpipe communicating with one of said chambers, and anequalizing-pipe between the chambers, one of said chambers opening tothe atmosphere` substantiallyY as described.

13. ln a triple valve, the combination of a cylindrical casing havingclosed ends, a double piston moving in said casing and forming chambersin the opposite ends of the casing, a slide-Valve carried by saidpiston, a trainpipe eomnumieating with one of said chambers, a springnormally holding the slide in lap position, and a restricted passagebetween the two chambers, substantially as described.

14. ln a triple Valve, the combination of a piston, a chamber on eachside thereof, a restricted connecting-passage, a trainpipe communicatingwith one of said chambers, said piston opening the other chamber to theatmosphere and closing the connecting-passage when the train-pipepressure is reduced, substantially as described.

l5. In a triple Valve, the combination of a piston, a chamber on eachside thereof, a restricted passage, a train-pipe communicating with oneof said chambers and means for auL tematically reducing the pressure inthe other chamber after the brakes have been applied, substantially asdescribed.

In testimony whereof I allix my signature in presence of two witnesses.

THALIA-XM K. OMIC/K.

litnessesz J. l). MACKAY, Noxa A. IlicNmcnsoN.

